♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/mdast-util-gfm-strikethrough/lib/index.js

@@ -1,106 +0,0 @@
-/**
- * @typedef {import('mdast').Delete} Delete
- *
- * @typedef {import('mdast-util-from-markdown').CompileContext} CompileContext
- * @typedef {import('mdast-util-from-markdown').Extension} FromMarkdownExtension
- * @typedef {import('mdast-util-from-markdown').Handle} FromMarkdownHandle
- *
- * @typedef {import('mdast-util-to-markdown').ConstructName} ConstructName
- * @typedef {import('mdast-util-to-markdown').Handle} ToMarkdownHandle
- * @typedef {import('mdast-util-to-markdown').Options} ToMarkdownExtension
- */
-
-/**
- * List of constructs that occur in phrasing (paragraphs, headings), but cannot
- * contain strikethrough.
- * So they sort of cancel each other out.
- * Note: could use a better name.
- *
- * Note: keep in sync with: <https://github.com/syntax-tree/mdast-util-to-markdown/blob/8ce8dbf/lib/unsafe.js#L14>
- *
- * @type {Array<ConstructName>}
- */
-const constructsWithoutStrikethrough = [
-  'autolink',
-  'destinationLiteral',
-  'destinationRaw',
-  'reference',
-  'titleQuote',
-  'titleApostrophe'
-]
-
-handleDelete.peek = peekDelete
-
-/**
- * Create an extension for `mdast-util-from-markdown` to enable GFM
- * strikethrough in markdown.
- *
- * @returns {FromMarkdownExtension}
- *   Extension for `mdast-util-from-markdown` to enable GFM strikethrough.
- */
-export function gfmStrikethroughFromMarkdown() {
-  return {
-    canContainEols: ['delete'],
-    enter: {strikethrough: enterStrikethrough},
-    exit: {strikethrough: exitStrikethrough}
-  }
-}
-
-/**
- * Create an extension for `mdast-util-to-markdown` to enable GFM
- * strikethrough in markdown.
- *
- * @returns {ToMarkdownExtension}
- *   Extension for `mdast-util-to-markdown` to enable GFM strikethrough.
- */
-export function gfmStrikethroughToMarkdown() {
-  return {
-    unsafe: [
-      {
-        character: '~',
-        inConstruct: 'phrasing',
-        notInConstruct: constructsWithoutStrikethrough
-      }
-    ],
-    handlers: {delete: handleDelete}
-  }
-}
-
-/**
- * @this {CompileContext}
- * @type {FromMarkdownHandle}
- */
-function enterStrikethrough(token) {
-  this.enter({type: 'delete', children: []}, token)
-}
-
-/**
- * @this {CompileContext}
- * @type {FromMarkdownHandle}
- */
-function exitStrikethrough(token) {
-  this.exit(token)
-}
-
-/**
- * @type {ToMarkdownHandle}
- * @param {Delete} node
- */
-function handleDelete(node, _, state, info) {
-  const tracker = state.createTracker(info)
-  const exit = state.enter('strikethrough')
-  let value = tracker.move('~~')
-  value += state.containerPhrasing(node, {
-    ...tracker.current(),
-    before: value,
-    after: '~'
-  })
-  value += tracker.move('~~')
-  exit()
-  return value
-}
-
-/** @type {ToMarkdownHandle} */
-function peekDelete() {
-  return '~'
-}